Tube-expander



(No Model.)

J. H. MGGRAW.

TUBE EXPANDBR.

Patented Jan. 15, 1884.

Unirse STATES PATENT @Prien f JOHN H. Moeniiw, or oswneo, New YORK.

TUBE-EXPANDER..

SPECIFICATION forming part of Letters Patent No. 292,027, dated January 15, 1,884.

Applicatonfiled AugustLlSSS. (Xomodcl.)

To @ZZ w/wm it mrtycolwerzt:

Be it known that I, JOHN H. McGRaw, of Oswego, in the county of Oswego, in the State of New York, have invented new and useful Improvements in Tube-Expanders, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

The invention consists in a novel construction and combination of the constituent parts of a nue-expander, organized with the view of rendering the same simple, compact, anddurable in construction, and capable of operating on iiues and hose-couplings of almost any diameter with the utmost efiiciency and convenience.

The invention is fully illustrated in theaunexed drawings,l wherein Figure lis a side Vview of my improved fine-expander. Fig. 2 is an end view ofthe same, with the gibs or compensati11g-blocks removed from between the bodysections for the purpose of illustrating more fully the connection of the body-sections by the yielding clampor expansible ring applied to the exterior of the body. Fig. 8 is a longitudinal section on line a' x, Fig. 2. Fig. 4 is a transverse section online g/y, Fig. 8, with the gibs in place. Fig. 5 isa longitudinal section of the expander,illustrating its adaptation for operating on hose-couplings; and Fig. 6 is a detached isometric view of one of the gibs or compensating-blocks employed between the roller-carrying body-sections for maintaining them equidistantly apart at their joints when distended.

Similar letters of reference indicate corresponding parts.

S denotes the operatingspindle of the tool, tapered in the usual manner, to spread apart the rollers which expand the flue. Hit-herto these rollers were either journaled in radiallyelongated bearings in a rigid nondistensible collar or body, or journaled to the exterior of an expansible body which rotated with the spindle. Such arrangements of parts, however, are defective and objectionablein several respects. In some of them the radial adjust,- ment of vthe rollers is too limited, and therefore it requires different tools for differentsized iiues, in others the axial support of the rollers is necessarily so frailas to deprive the to extend through the collarorbodyA, which surrounds the spindle, and is divided longitudinally, preferably into two semi-cylindrical parts, each of which. is provided on its inner surface with two longitudinal channels, in which two of the rollers are embedded and fitted loosely enough to allow them to freely rotate therein. The large end of the rollers projects from the face of the collar the requisite distance to reach into the flue sufficiently to operate on the same in the flue-hole of the fluesheet and a short distance inside of the boiler. The small end of the rollers projects from the opposite end or back of the collar A, and is provided with a circumferential groove, a,

into which iits a semicircular excision in the edge of a plate, b, which is detachably secured to the end of the collar-section. The internal longitudinal channels of the collar are of adepth to embrace about three-fourths of the circumference ofthe rollers, the latter being inserted endwise in said channel, and retained therein by the plate I engaging the groove a of the rollers. I do not, however, limit my invention to the before-describedmeans of securing the rollers in the collar, as itis obvious that the same can be accomplished by other means-ms, for instance, by a circumferential diminution of the rollers inside of the collar, formiiw shoulders on the face of the same, and

a threat` and nut or thimble and pin on the f small end of the rollers. rlhe collar with its rollers are held around the spindle by a yielding clamp, el, in thei'orm of an expansiblering or coiled spring-band surrounding the collar.

In operating the described flue-expander, the spindle S is first withdrawn to allow the collar A to contract sufficiently to allow the protruding ends of the rollers to be inserted into the flue, the face of the collar being brought to bear on the end of the iiue. Then the spindle is forced between the rollers, to spread them IOO apart and bring them to bear on the interior of the iiue, the spring-band d being of s uicient length to allow the collar A to expand to most any required diameter, and thus adapt the tool to operate on flues of most any ordinary size. After the tool has been set for operation as aforesaid, a wrench is applied to the spindle to turn the same. In the rotation of the spindle the frictional bearing thereof on the entire length of the rollers imparts .rotation to the latter and causes theln to traverse around the interior of the flue, the outward pressure of the fine being increased by driving the spindle farther into the expansible collar A, and this being continued until the flue is properly expanded.

It will be observed that the large end of the tapering rollers Yproduces a slightly greater expansion of the flue inside of the boilery than at the end of the flue. rIlhis, in conjunction with the usual beat subsequently formed on the end of the flue, firmly secures the flue to the flue-sheet without danger of excessive pressure of the flue on the sharp edges of the iiue-holein the sheet. Furthermore, the operation of the large end of the rollers inside of the flue serves to retain the tool in its operative position.

'To remove the expander from the flue, the spindle S is withdrawn. The collar or bodyA will then automatically contract and liberate the rollers from the flue.

` In order to maintain the collarsections equidistantly distributed around the spindle during the rotation of the latter, I insert between the collar-sections gibs or compensati ng-blocks d', which are of the same depth as the collar, and of the requisite width to fill the space between the distended sect-ions, as illustrated in Figs. l and 4 of the drawings. This prevents thecollar-seetions from shifting, so as to widen the space between them on one side of the spindle and correspondingly close the space at i the opposite side, which tendency is due to the circumierential strain exerted on the collarsections by the rotation of the spindle.

For fastening hose to their couplings, I employ rollers o", fitted to the collar or body A in the same manner as the rollers o, before described; but the protruding large end of the roller r', I provide with a circumferential rabbet, e, extending from the collar A to the tuberolling portion s of the roller. Said rabbet is of a length to receive in it the coupling f, and is sufficiently deep to allow the roller'end s to bear on and expand the ring g, which binds the end ofthe hosein the gland h of the coupling, as illustrated in Fig. 5 of the drawings.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. A flue-expander comprising a tapering spindle, conversely tapered rollers, and an eX- pansible collar or body holding the rollers around the spindle, as specified. I

2. A fine-expander consisting of atapering spindle, an expansible body surrounding the spindle, and rollers interposed between said spindle and body and projecting with their ends at the face of the body, substantially as set forth.

3. A fine-expander consisting of a longitudinally-divided collar or body, rollers partly embedded in the inner surface of the collarsections and projecting at the end thereof, a yielding clamp applied to the collar, and atapering spindle passing through the collar between the inclosed rollers, substantially as described and shown.

4:. In combination with the tapering spindle, thelongitudinally-divided collar provided internally with longitudinal channels, tapering rollers arranged in said channels and projecting at the end of the collar, and provided at one end with a circumferential groove, plates removably secured `to the end of the collar-sections and engaging the. groove of the rollers, and a yielding clamp applied to the exterior of the collar, all as described and shown.

5. In combination with the tapering spindle and tube-expanding rollers. the roller-earrying body, divided longitudinally, ayielding clamp applied to the exterior of the body, and gibs or compensating-blocks'inserted between the body-sections, substantially as and for the purpose specified.

6. In combination with the tapering spindle and expansible body, the interposed rollers projecting at the end of said body, and provided between the same and the tube-rolling portion of the roller with a circumferen# tial rabbet,substantially in the :manner described and shown, for the. purpose set forth.

In testimony whereof I have hereunto. signed my name and affixed my seal, in the presence of two attesting witnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 26th day of July, 1883.

JOHN H. MCGRAW. [1.. s]

Witnesses FREDERICK H. Gines, NVM. CHANDLER RAYMOND.

IOC: 

